RecyclerView初步认识

1 引入包：com.android.support:recyclerview-v7:23.1.0

】知识点

//支持5.0新特性

compile ‘com.android.support:design:23.1.0’

一 在android studio添加包时，搜索

com.android.support:recyclerview-v7:23.1.0

二 各种item的摆放方式

① 横向的ListView,只需要设置LinearLayoutManager的方向

//创建线性布局
LinearLayoutManager layout = new LinearLayoutManager(this);
layout.setOrientation(LinearLayoutManager.HORIZONTAL);

② 网格布局

LinearLayoutManager layout = new GridLayoutManager(MainActivity.this,5);

说明:第二个参数设置item的个数，方向如果是横向的，纵向有5个，方向是纵向，则横向有5个item

三 item之间的分割线

可以在xml文件中添加ImageView设置背景色实现

package com.kk;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity {

private RecyclerView recyclerView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.rc);
//创建线性布局
LinearLayoutManager layout = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layout);
//添加适配器
recyclerView.setAdapter(new Myadapter(getData()));
}

private List<String> getData() {
List<String> list = new ArrayList<String>();
for (int i = 0; i < 100; i++) {
list.add("item" + i);
}
return list;
}

/**
* RecyclerView的适配器
*/

class Myadapter extends RecyclerView.Adapter<Myadapter.MyHolder> {

private List<String> list;

public Myadapter(List<String> list) {
this.list = list;

}
/**
* 创建新的view,被LayoutManager调用
*
* @param parent
* @param viewType
* @return
*/
@Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recyclerview, parent,false);
MyHolder myHolder = new MyHolder(view);
return myHolder;
}

/**
* 将数据与界面进行绑定
*
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(MyHolder holder, int position) {
holder.tv.setText(list.get(position));
}

@Override
public int getItemCount() {
return list.size();
}

/**
* 自定义ViewHolder继承 RecyclerView.ViewHolder
*
* @author Administrator
*/
public class MyHolder extends RecyclerView.ViewHolder {
public TextView tv;
public MyHolder(View itemView) {
super(itemView);

tv=(TextView)itemView.findViewById(R.id.tv);
}

}
}

}